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Finding the Fourth Proportional to 402.45, 555.40 and 245.05

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Solution

The fourth proportional to 402.45, 555.40 and 245.05 is: 338.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.45 : 555.40 = 245.05 : x
  2. Step 2: Convert to fraction form
    402.45/555.40 = 245.05/x
  3. Step 3: Cross multiply
    402.45x = 555.40 × 245.05
  4. Step 4: Simplify right side
    402.45x = 136,100.77
  5. Step 5: Solve for x
    x = 136,100.77/402.45
  6. Step 6: Final answer
    x = 338.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.